If the date in D7 equals any of the dates showing in E29 to e41 then multiply
the corresponding row in the c column by b5 and add them together to appear
in this cell

=IF('Cattle Budget'!D7='Cattle Mvts'!E29:'Cattle Mvts'!E41,'Cattle
Mvts'!C29*'Feedlot Assumptions'!B5,0)